Cylindrical grinding machine for shoulder grinding



I Aug. 22, 1939. L. A. WILLIAMS ET AL 2,170,313

CYLINDRICAL GRINDING MACHINE FOR SHOULDER GRINDING Filed Dec. 22; 1957 2 Sheets-Sheet 1 I I' I Z6 37 20 Z0 LEW/s H. VVILL/HMS FI'LHERT C. EFIE/NE Aug. 22, 1939., 2,170,613

cumnarcm. amnnme momma FOR snoumma GRINDING L. A. WILLIAMS ET AL Filed Dec. 22, 1937 2 Sheets-Sheet 2 grwcwtoo LEWIS H. VVILLIFIMS F11 BERT E. RED/NE due: a;

Patented Aug. 22, 1939 UNITED STATES CYLINDRICAL GRINDING MACHINE FOR SHOULDER GRINDING Lewis A. Williams, Shrewsbury, and Albert 0. Racine, Worcester, Mass, assignors to Norton Company, Worcester, Mass, a corporation of Massachusetts Application December 22, 1937, Serial No. 181,174

Claims.

This invention relates to grinding machines,

and more particularly to a safety device for a wheel feeding mechanism in a cylindrical grinding machine. One object of the invention is to provide a simple and thoroughly practical machine for grinding cylindrical work having a plurality of diameters thereon to be ground. A further object of the invention is to provide a safety device for a multi-diameter work grinding machine which prevents the wheel from being fed into the work except when the work table is in a predetermined relationship with the grinding wheel. Another object of this invention is to provide an interlock between the work table and the grinding wheel infeeding movement which prevents the table from traversing longitudinally unless the grinding wheel is withdrawn a sufficient distance to clear the adjacent portion of the work piece. Another object of the invention is to provide a stepped block on the work table and a movable stop member on the base, one of which is moved by and in timed relation with the wheel feeding movement to form an interlock between the table and Wheel slide movement to prevent an infeeding movement of the wheel unless the work piece is in a predetermined location relative to the grinding wheel.

The invention accordingly consists in the features of construction, combinations of elements, and arrangements of parts, as will be exemplified in the structure to be hereinafter described, and the scope of the application of which will be indicated in the following claims.

In the accompanying drawings, in which is shown one of the possible embodiments of the mechanical features of this invention,

Fig. 1 is a fragmentary front elevation of a H; grinding machine; 40'

Fig. 2 is a fragmentary plan view, on an enlarged scale, of the wheel feeding mechanism;

Fig. 3 is a fragmentary cross sectional view, taken approximately on the line 33 of Fig. 1, showingthe wheel slide and work table in elevation and the base in cross section;

Fig, 4 is a fragmentary end elevation and sectional view, taken approximately on the line 4--4 of Fig. 1, showing the safety mechanism which H is actuated by the wheel feeding mechanism;

Fig. 5 is a fragmentary sectional view, on an enlarged scale, taken approximately on the line 5-5 of Fig. 4-; and

Fig. 6 is a fragmentary cross sectional View,

' taken approximately on the line 6-6 of Fig. 5.

A cylindrical grinding machine has been illustrated in the drawings having a base III which supports a transversely movable wheel slide I I on the usual V-way and flat way (not shown). The wheel slide I I supports a rotatable grinding wheel I 4 which is mounted on one end of a rotatable wheel spindle I5. The spindle I5 is journalled in suitable bearings (not shown) in the wheel slide I I.

The grinding wheel I4 and its supporting spindle I5 may be rotated in a suitable manner, such as by means of an electric motor I6 mounted on the upper surface of the wheel slide II. A motor armature shaft I! is provided at its outer end with a multiple V-groove pulley I8 which is connected by multiple V-belts I9 with a pulley mounted on the outer end of the wheel spindle I5. It will be readily apparent from the foregoing disclosure that rotation of the motor I6 is transmitted to rotate the wheel spindle I5 and the grinding wheel I4.

- The base II] also supports a longitudinally reciprocable work supporting table 2! which is mounted on the usual flat way 22 and V-way 23 and is arranged to slide longitudinally relative to the transversely movable wheel slide II and grinding wheel I4.

The work table 2| is provided with a rotatable work support comprising a headstock 24 having a headstock center 25 which is arranged rotatably to support one end of a cylindrical work piece. A footstock 26 is also mounted on the table 2| and carries a footstock center 21 which serves as a rotatable support for the other end of a work piece 28. The headstock center 25 and footstock center 21 serve rotatably to support the work 3 piece 28 for a grinding operation. A work driving dog 29, of any well known type, is clamped on the end of the work piece 28 and is arranged to be engaged and driven by a driving pin 30 carried by a rotatable driving plate 3I on the headstock 24. The work piece 28, as illustrated, is a piece having several cylindrical portions of different diameters to be ground, namely portions 35, '36 and 37.

The table I I is arranged for a longitudinal reciprocatory movement on the base I0 and may be moved either manually or automatically under power, as will be hereinafter described. A manual table traversing mechanism has been illustrated comprising a manually operable traverse wheel 49 which is mounted on the outer end of a rotatable shaft 4|. A gear 42 carried by the shaft 4| meshes with a gear 43 which is mounted on a. rotatable shaft 44. The shaft 44 also carries a gear 45 meshing with a rack bar 46 depending from the work supporting table 2|.. By rotation of the traverse wheel 40, the tab-1e 2| may be caused to traverse longitudinally relative to the base I0 so as to position and grind either the portion 35, 36 or 31, as is desired.

If desired, the table 2| may be reciprocated automatically by means of a power driven mechanism, such as that shown in the prior U. S. patents to Norton No. 762,838 dated June 14, 1904, and Wilcox, et al. No. 1,197,700, dated September 12, 1916, to which reference may be had for details of disclosure not found herein. A stepped driving pulley (not shown) contained within the casing 50 serves to rotate a shaft 5| which drives a table driving and reversing mechanism contained within the casing 52 (Fig. 1). The driving and reversing mechanism includes a reversing clutch which is arranged to be actuated by a pivotally mounted reversing lever 53 which may be actuated automatically by adjustable table dogs (not shown) mounted on the front edge of the table 2|.

The grinding wheel I4 may be fed transversely toward and from the work piece 28 by a wheel feeding mechanism which may comprise a half nut 65 depending from the wheel slide II which meshes with a rotatable feed screw 6| which is journalled in suitable bearings (not shown) at its rear end. The front reduced end portion 62 of the feed screw 6! is slidably keyed in a sleeve 63 journalled in a bearing 64 in the base I0. The sleeve 63 has formed integral therewith a shaft 65 which carries a gear 66 on its outer end. The gear 66 meshes with a small gear 61 which is carried by a rotatable sleeve 68 and has formed integral therewith a gear 69. A manually operable hand feeding device II! is connected to rotate the gear 69 by means of a micrometer adjusting mechanism II which is similar in construction to that shown in the prior U. S. Patent No. 1,197,700 above referred to, to which reference may be had for further details of disclosure. By manipulation of the micrometer adjusting mechanism, a multi-stop ring 17 supported on the periphery of the feed wheel gear 69 may be adjusted precisely to locate and size the spaced multi-diameter portions of the work piece being ground. A stop pawl I5 pivotally mounted on a stud I6 is arranged to engage adjustable stops carried by the stop ring 77.

In grinding work pieces having several diameters to grind, it is desirable to use a multi-stop device which may comprise the multi-stop ring I! which is mounted on the periphery of the gear 69 of the feed mechanism. The multi-stop ring 11 is arranged to carry a plurality of adjustable stop blocks I8, I9 and which are adjustably mounted in a groove cut in the periphery of the multistop ring 17. The adjustable stop blocks I8, "I9 and 80 are adapted to cooperate with the stop pawl I5 so as to stop the infeeding movement of the grinding wheel when it has fed into the work to a predetermined extent.

In grinding shouldered work or multi-diameter cylindrical work of the type illustrated in the drawing, it is desirable to provide a suitable safety device to prevent the grinding wheel from being fed in except when the proper portion of the work piece 28 is opposite the grinding wheel I4, and to prevent a longitudinal traversing movement of the work table 2| unless the grinding wheel it is withdrawn a sufficient distance to clear the adjacent portion of the work piece 28. To accomplish this result, a multi-stepped block is adjustably mounted on the front edge of the table 2|. This block 85 has a series of steps 86, 8'1 and 88 which correspond to the several diameters 31, 36 and 35, respectively, on the work piece 28 to be ground. In order to prevent the grinding wheel I4 from being fed into the work piece 28 at the wrong time, a suitable interlock is provided between the table 2| and the grinding wheel feeding mechanism. This mechanism comprises a pivotally mounted lever 90 which is supported on a stud 9| on the base III. The lever 90 is provided with an aperture 92 which is arranged to receive the inner end of a screw threaded member 93. The screw threaded member 93 has a series of V-shaped notches 94, preferably four in number, cut at a point adjacent toits inner end. A pair of pointed set screws 95 and 96 are screw threaded into the lever 90 on diametrically opposite sides of the screw threaded member 93 and have their points engaging the opposed. notches 94 out in the screw threaded member 93. In order to move the pivoted stop arm 90 in timed relation with the rotation of the feed wheel III, a gear I00 is keyed to a rotatable sleeve |0I which is in turn supported in the anti-friction bearing I02. The bearing I02 is supported in the bracket I03 which is in turn fixedly mounted on the base III. The sleeve I0! is held against endwise movement at one end by a flange formed integral with the sleeve IEII and at the inner end by an adjustable collar I04 screw threaded onto a threaded portion on the inner end of the sleeve It I. The sleeve IIII has its inner aperture threaded to mesh with the screw threaded member 93. A gear I05 is formed integral with the multistop ring I1 and meshes with the gear I00.

When the manually operable feed wheel I0 is rotated to feed the grinding wheel I4 toward the work piece 28, rotation of the multi-stop ring 11 and gear I05 is transmitted to the gear I00 to rotate the sleeve nut I0 I. The rotation of the sleeve nut I0 I, through its internal thread transmits an endwise movement to the screw threaded member 93 which in turn rocks the lever 90 about its pivot 3| so that the upper end of the lever 90 moves toward and from the stepped stop bar 85 which is carried by the table 2|.

It will be readily apparent from the foregoing disclosure that unless the table 2| is located so that the upper end of the lever 90 is in position to engage the portion of the stepped bar 85 corresponding to the portion of the work piece 28 which is in opposite the grinding wheel, the grinding wheel and its supporting slide cannot be fed forward to grind the wrong portion of the work. Similarly, when the grinding wheel is in an operative position, such as is shown in Fig. 1, to grind the portion 37 of the work piece 28, the table 2| cannot be traversed longitudinally toward the right to damage the enlarged portion 36 of the work piece 28 due to the fact that the step 81 on the stop bar 85 serves as a stop to prevent longitudinal movement of the table until the grinding wheel has receded a sufficient distance to clear the periphery of the shoulder 36.

A separate multi-stop bar 85 is provided for each type of work piece which is to be ground in the machine. The longitudinal spacing ofthe steps on the bar as well as the depth of each successive step is made to correspond with the multi-diameter portions of the work piece to be ground. These stop blocks may be readily mount- ,ed on the front of the table 2| in setting up the machine for grinding a given work piece.

The operation of this mechanism will be readily apparent from the foregoing disclosure. A multi'-' stepped stop bar 85 corresponding to the work piece to be ground is mounted on the front edge of the table and is positioned longitudinally thereon to correspond with the work piece when mounted upon the headstock center 25 and footstock center 21. The machine may then be operated in the usual manner, that is, the table traversed longitudinally to position the desired portion of the Work piece in operative relation with the grinding wheel, and the wheel may then be fed into the work by rotation of the manually operable feed wheel 10. Unless the table has been moved to position the proper portion of the work in operative relation with the grinding wheel, the wheel cannot be fed in due to the fact that the stop block or lever 90 will engage a portion of the stop bar 5 and prevent feeding the grinding wheel into the wrong portion of the work piece. Similarly, the table 2| cannot be traversed longitudinally to bring a larger diameter portion of the work into operative relation with the grinding wheel until the grinding wheel slide has first been moved rearwardly a sufficient distance so that the work piece will clear the grinding wheel when the table is traversed longitudinally.

It will thus be seen that there has been provided by this invention apparatus in which the various objects hereinabove set forth together with many thoroughly practical advantages are successfully achieve-d. As many possible embodiments may be made of the above invention and as many changes might be made in the embodiment above set forth, it is to be understood that all matter hereinbefore set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

We claim: 7

1. In a cylindrical grinding machine, a rotatable grinding wheel, a transversely movable slide therefor, a longitudinally movable table, a rotatable work support thereon including a headstock and a footstock, means to traverse said table longitudinally, a feeding mechanism to feed said wheel slide transversely toward and from said work table to grind a work piece supported thereon, a multi-stepped stop bar which is adjustably mounted on said table, a moveable stop lever associated therewith, and means actuated automatically in timed relation with the feeding mechanism to cause a relative approaching and receding movement between said stop lever and bar.

2. In a cylindrical grinding machine, a rotatable grinding wheel, a transversely movable slide therefor, a longitudinally movable work table, a rotatable work support thereon including a headstock and a footstock, means to traverse said table longitudinally, a feeding mechanism to feed said wheel slide transversely successively to grind spaced multi-diameter portions on a work piece, a safety device including a multi-stepped stop bar and a stop arm which are moved relatively toward and from each other, and operative connections between said feeding mechanism and said safety device whereby the stop arm is moved thereby so as to prevent a longitudinal or traversing movement of the table to position a larger diameter portion of the work piece in operative relation with the wheel until the Wheel has been moved rearwardly to a predetermined extent.

3. In a cylindrical grinding machine, a rotatable grinding wheel, a transversely movable slide for said wheel, a longitudinally movable Work table, a rotatable work support thereon including a headstock and a footstock, means to traverse said table longitudinally, a nut and screw feed mechanism to feed said slide transversely, a manually operable feed wheel to rotate said screw, and a stop device including a stepped bar on said table and a movable member actuated automatically by said feed wheel to stop the infeeding movement of the grinding wheel before it engages the work piece unless a predetermined portion of the work piece is in operative relation with the grinding wheel.

4. In a cylindrical grinding machine, a rotatable grinding wheel, a transversely movable slide for said wheel, a longitudinally movable work table, a rotatable work support thereon including a headstock and a footstock, means to traverse said table longitudinally, means tofeed said grinding wheel slide transversely toward and from said table to grind a work piece supported thereon, a stepped bar adjustably mounted on said table, and means including a pivotally mounted. stop block which cooperates with said stepped bar and is actuated automatically by said feed mechanism to prevent an infeeding movement of the grinding wheel unless a predetermined portion of the work piece is in operative position with relation to the grinding wheel,

5. In a cylindrical grinding machine, a rotatable grinding wheel, a transversely movable slide therefor, a longitudinally movable table having a rotatable work support thereon, means to traverse said table longitudinally, a feeding mechanism to feed said wheel slide transversely, a multi-stepped stop bar adjustably mounted on said table, a movable stop lever associated therewith, a nut and screw mechanism to move said stop block and bar relatively toward and from each other, and means including a gear mechanism actuated automatically by said feeding mechanism to operate said nut and screw mechanism.

LEWIS A. WILLIAMS. ALBERT C. RACLNE. 

